The following is a brief outline of each type of psoriasis and a description of the accompanying signs and symptoms.

Plaque psoriasis is the most common form. It is named for the “plaques,” or lesions, that are characteristic of this type of psoriasis. Plaques tend to be stable and slow growing, and they may remain unchanged for long periods of time.

Signs and symptoms include:

Red, raised skin patches (plaques) topped by silvery-white scales

Frequent shedding of silvery scales

Outbreaks most frequent on the elbows, knees, scalp, buttocks, and lower back

Patches often occur in the same area on both sides of the body

Patches may join together to form large affected areas on the back and chest

May involve anywhere from a few areas to almost covering the entire body surface

Occasional discomfort and cracking in the affected areas, especially palms, fingers, and soles

Patches may be itchy

Guttate psoriasis is most often triggered by bacterial infections, such as streptococcus (strep throat) or viral infections, and is most common in childhood or young adulthood.

Signs and symptoms include:

Small, salmon pink, drop-like lesions on the trunk, limbs, and scalp

Most commonly found in skin fold areas of the body, such as the armpits, groin, under the breasts, and genital areas. This type of psoriasis is also known as flexural psoriasis.

Signs and symptoms include:

Smooth, pink or red, mostly dry patches without a scaly surface

Sensitivity to friction and sweating

This is the least common form of the disease. It can be triggered by severe sunburn, use of certain drugs, or abrupt withdrawal of oral steroids.

Signs and symptoms include:

Widespread, fiery redness of the skin

Severe itching and discomfort in the affected areas

Possible swelling of the affected areas

This form of psoriasis may be triggered by medication, emotional stress, infections, abrupt withdrawal of systemic steroids, or exposure to certain chemicals. It is a more rare form of psoriasis.

Signs and symptoms include:

Blisters containing noninfectious pus in large (generalized) or small (localized) areas of the body

Localized:
Blisters confined to local areas, usually the palms, fingers, and soles. Pustules appear in a studded pattern, turn brown, and then peel.

Generalized:
Blisters spread over large portions of the body, dry, and then recur again in repeated cycles lasting several days.

Revision Information

This content is reviewed regularly and is updated when new and relevant evidence is made available. This information is neither intended nor implied to be a substitute for professional medical advice. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with questions regarding a medical condition.